guloader | 1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1

Analysis

max time kernel
150s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
07-11-2024 02:11

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General

Target

1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe
Size

1.3MB
MD5

3392cd428f177152dcf9ac6256365b1a
SHA1

3e454db1c2d909510594a48efbe0380c3194aa2f
SHA256

1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1
SHA512

53265bead60447f7dd26db363dfe3a698d83c51019c4fa1d51907d5166cd53e11dae4da51ee3ebe162f0313ac6b2971a0a3904a4738fde116d835eab4c4d53bb
SSDEEP

24576:Z6k1f9gIpCzUjadgzQdbzyoxSyz74WCePDMoqno2NND74lams:ZJFmSCzyApoy/p3PDP6Ela3

Score

10^/10

guloader remcos remotehost collection discovery downloader rat spyware stealer

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

212.162.149.220:2404

Attributes

audio_folder
MicRecords
audio_path
ApplicationPath
audio_record_time
5
connect_delay
0
connect_interval
1
copy_file
remcos.exe
copy_folder
Remcos
delete_file
false
hide_file
false
hide_keylog_file
false
install_flag
false
keylog_crypt
false
keylog_file
logs.dat
keylog_flag
false
keylog_folder
remcos
mouse_option
false
mutex
Rmc-2JYO24
screenshot_crypt
false
screenshot_flag
false
screenshot_folder
Screenshots
screenshot_path
%AppData%
screenshot_time
10
take_screenshot_option
false
take_screenshot_time
5

Signatures

Guloader family
guloader
Guloader,Cloudeye
A shellcode based downloader first seen in 2020.
downloader guloader
Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Remcos family
remcos

Detected Nirsoft tools 7 IoCs

Free utilities often used by attackers which can steal passwords, product keys, etc.

Processes:

resource	yara_rule
behavioral2/memory/4376-51-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/4376-53-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft
behavioral2/memory/3356-47-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft
behavioral2/memory/3116-46-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/3116-44-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/3116-48-0x0000000000400000-0x0000000000462000-memory.dmp	Nirsoft
behavioral2/memory/3356-62-0x0000000000400000-0x0000000000478000-memory.dmp	Nirsoft

NirSoft MailPassView 3 IoCs

Password recovery tool for various email clients

Processes:

resource	yara_rule
behavioral2/memory/3116-46-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral2/memory/3116-44-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView
behavioral2/memory/3116-48-0x0000000000400000-0x0000000000462000-memory.dmp	MailPassView

NirSoft WebBrowserPassView 2 IoCs

Password recovery tool for various web browsers

Processes:

resource	yara_rule
behavioral2/memory/3356-47-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView
behavioral2/memory/3356-62-0x0000000000400000-0x0000000000478000-memory.dmp	WebBrowserPassView

Loads dropped DLL 2 IoCs

Processes:

1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

pid	Process
4236	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe
4236	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

Reads user/profile data of web browsers 3 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

Credentials from Web Browsers
T1555.003

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

Processes:

1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs

Processes:

1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

pid	Process
3112	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs

Processes:

1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

pid	Process
4236	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe
3112	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

Suspicious use of SetThreadContext 4 IoCs

Processes:

1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

description	pid	Process	procid_target
PID 4236 set thread context of 3112	4236	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe	90
PID 3112 set thread context of 3356	3112	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe	101
PID 3112 set thread context of 3116	3112	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe	102
PID 3112 set thread context of 4376	3112	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe	103

Drops file in Windows directory 1 IoCs

Processes:

1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

description	ioc	Process
File opened for modification	C:\Windows\karga.ini	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

Processes:

1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

pid	Process
3356	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe
3356	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe
4376	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe
4376	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe
3356	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe
3356	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

Suspicious behavior: MapViewOfSection 4 IoCs

Processes:

1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

pid	Process
4236	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe
3112	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe
3112	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe
3112	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

description	pid	Process
Token: SeDebugPrivilege	4376	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

pid	Process
3112	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

Suspicious use of WriteProcessMemory 14 IoCs

Processes:

1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe

description	pid	Process	procid_target
PID 4236 wrote to memory of 3112	4236	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe	90
PID 4236 wrote to memory of 3112	4236	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe	90
PID 4236 wrote to memory of 3112	4236	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe	90
PID 4236 wrote to memory of 3112	4236	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe	90
PID 4236 wrote to memory of 3112	4236	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe	90
PID 3112 wrote to memory of 3356	3112	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe	101
PID 3112 wrote to memory of 3356	3112	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe	101
PID 3112 wrote to memory of 3356	3112	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe	101
PID 3112 wrote to memory of 3116	3112	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe	102
PID 3112 wrote to memory of 3116	3112	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe	102
PID 3112 wrote to memory of 3116	3112	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe	102
PID 3112 wrote to memory of 4376	3112	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe	103
PID 3112 wrote to memory of 4376	3112	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe	103
PID 3112 wrote to memory of 4376	3112	1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe	103

C:\Users\Admin\AppData\Local\Temp\1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe
"C:\Users\Admin\AppData\Local\Temp\1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe"
1⤵
- Loads dropped DLL
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Suspicious use of SetThreadContext
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:4236
- C:\Users\Admin\AppData\Local\Temp\1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe
  "C:\Users\Admin\AppData\Local\Temp\1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe"
  2⤵
  - Suspicious use of NtCreateThreadExHideFromDebugger
  - Suspicious use of NtSetInformationThreadHideFromDebugger
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3112
- - C:\Users\Admin\AppData\Local\Temp\1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe
    C:\Users\Admin\AppData\Local\Temp\1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe /stext "C:\Users\Admin\AppData\Local\Temp\zsmrjcrbtekpzhqyjqdkkigsmzg"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    PID:3356
- - C:\Users\Admin\AppData\Local\Temp\1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe
    C:\Users\Admin\AppData\Local\Temp\1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe /stext "C:\Users\Admin\AppData\Local\Temp\jmrbcvcchmcuknecsbqlvvbjugqowx"
    3⤵
    - Accesses Microsoft Outlook accounts
    - System Location Discovery: System Language Discovery
    PID:3116
- - C:\Users\Admin\AppData\Local\Temp\1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe
    C:\Users\Admin\AppData\Local\Temp\1f785691c057f5062ac9d630cf304ad946c825928c87e63172f335e96beddda1.exe /stext "C:\Users\Admin\AppData\Local\Temp\mpxucnnwduuzmcaokmknxavsdmixpibtr"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4376

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials from Password Stores

T1555

Credentials from Web Browsers

T1555.003

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\ProgramData\remcos\logs.dat

Filesize
144B

MD5
463c5812eceb98234dfdc3dc344feb46

SHA1
06cf4bad9272371ca9992c785bcc4787c1b16ec5

SHA256
ec974c2122481f24eb6b31248373a3173c3be7adffa8bf4d15cfd3556341d403

SHA512
adef9fe1a9738ebc19a65053a85f3b29b5fbc5326371890e2328328e5cf7229705ab50fa2acb9b24e19c5dc7b00d86c574ab3146693e5a71f19576adde0498bd

Download Submit
C:\Users\Admin\AppData\Local\Temp\nsbB0D2.tmp\System.dll

Filesize
11KB

MD5
fc3772787eb239ef4d0399680dcc4343

SHA1
db2fa99ec967178cd8057a14a428a8439a961a73

SHA256
9b93c61c9d63ef8ec80892cc0e4a0877966dca9b0c3eb85555cebd2ddf4d6eed

SHA512
79e491ca4591a5da70116114b7fbb66ee15a0532386035e980c9dfe7afb59b1f9d9c758891e25bfb45c36b07afd3e171bac37a86c887387ef0e80b1eaf296c89

Download Submit
C:\Users\Admin\AppData\Local\Temp\zsmrjcrbtekpzhqyjqdkkigsmzg

Filesize
4KB

MD5
562a58578d6d04c7fb6bda581c57c03c

SHA1
12ab2b88624d01da0c5f5d1441aa21cbc276c5f5

SHA256
ff5c70287ba432a83f9015209d6e933462edca01d68c53c09882e1e4d22241c8

SHA512
3f6e19faa0196bd4c085defa587e664abdd63c25ef30df8f4323e60a5a5aca3cd2709466f772e64ab00fe331d4264841422d6057451947f3500e9252a132254e

Download Submit
memory/3112-43-0x00000000772D1000-0x00000000773F1000-memory.dmp

Filesize
1.1MB

Download
memory/3112-80-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/3112-29-0x00000000016F0000-0x000000000301C000-memory.dmp

Filesize
25.2MB

Download
memory/3112-67-0x0000000034000000-0x0000000034019000-memory.dmp

Filesize
100KB

Download
memory/3112-31-0x0000000077375000-0x0000000077376000-memory.dmp

Filesize
4KB

Download
memory/3112-32-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/3112-36-0x00000000016F0000-0x000000000301C000-memory.dmp

Filesize
25.2MB

Download
memory/3112-38-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/3112-77-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/3112-107-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/3112-68-0x0000000034000000-0x0000000034019000-memory.dmp

Filesize
100KB

Download
memory/3112-101-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/3112-98-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/3112-64-0x0000000034000000-0x0000000034019000-memory.dmp

Filesize
100KB

Download
memory/3112-92-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/3112-74-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/3112-71-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/3112-95-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/3112-30-0x0000000077358000-0x0000000077359000-memory.dmp

Filesize
4KB

Download
memory/3112-104-0x0000000000490000-0x00000000016E4000-memory.dmp

Filesize
18.3MB

Download
memory/3116-44-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/3116-40-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/3116-46-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/3116-48-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/3116-42-0x0000000000400000-0x0000000000462000-memory.dmp

Filesize
392KB

Download
memory/3356-39-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/3356-62-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/3356-45-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/3356-47-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/4236-25-0x0000000004A30000-0x000000000635C000-memory.dmp

Filesize
25.2MB

Download
memory/4236-28-0x0000000004A30000-0x000000000635C000-memory.dmp

Filesize
25.2MB

Download
memory/4236-26-0x00000000772D1000-0x00000000773F1000-memory.dmp

Filesize
1.1MB

Download
memory/4236-27-0x0000000010004000-0x0000000010005000-memory.dmp

Filesize
4KB

Download
memory/4376-49-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4376-53-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4376-50-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download
memory/4376-51-0x0000000000400000-0x0000000000424000-memory.dmp

Filesize
144KB

Download